U.S. patent application number 10/175649 was filed with the patent office on 2003-12-25 for pull rod-type foldable chair structure.
Invention is credited to Huang, Tsung-Chieh.
Application Number | 20030234563 10/175649 |
Document ID | / |
Family ID | 29733931 |
Filed Date | 2003-12-25 |
United States Patent
Application |
20030234563 |
Kind Code |
A1 |
Huang, Tsung-Chieh |
December 25, 2003 |
PULL ROD-TYPE FOLDABLE CHAIR STRUCTURE
Abstract
Pull rod-type foldable chair structure. A pull rod is
telescopically inserted in the top end of the rear chair leg and
pivotally connected with the front chair leg. When folding or
unfolding the rear chair leg, the pull rod provides a pneumatic
buffing effect. Two J-shaped lateral support boards are previously
mounted on inner sides of the chair frame, whereby the seat can be
directly assembled with the support boards by insertion. The back
is assembled with the upper end of the front chair leg by engaging
members. Therefore, the chair frame, the seat and the back can be
quickly assembled. The transverse beam of the chair leg is equipped
with elastic ground-contacting blocks. Therefore, the chair can be
used on any floorboard made of any material such as wooden, plastic
and stone floorboards. The ground-contacting block will not scrape
the floorboard and the chair can be more stably placed on the
ground.
Inventors: |
Huang, Tsung-Chieh;
(Kaohsiung Hsien, TW) |
Correspondence
Address: |
Keith Kline
PRO-TECHTOR INTERNATIONAL SERVICES
20775 Norada Court
Saratoga
CA
95070-3018
US
|
Family ID: |
29733931 |
Appl. No.: |
10/175649 |
Filed: |
June 19, 2002 |
Current U.S.
Class: |
297/58 |
Current CPC
Class: |
A47C 4/18 20130101; A47C
7/002 20130101; A47C 4/24 20130101 |
Class at
Publication: |
297/58 |
International
Class: |
A47C 004/18 |
Claims
What is claimed is:
1. Pull rod-type foldable chair structure comprising a front chair
leg, a rear chair leg, a seat, a back, two pull rods, two support
boards and ground-contacting blocks, wherein: the bottom transverse
beam of the front chair leg is provided with ground-contacting
blocks and ground-contacting block seat bodies coupled with the
ground-contacting blocks, via a pivot member, an inner side of
middle section of the front chair leg being pivotally connected
with a pivot hole near a middle section of the support board, one
side of upper section of the front chair leg being formed with
engaging holes for engaging with the back, via a pivot member, an
outer side of the front chair leg between the pivot member and the
back being pivotally connected with the pull rod inserted in a top
section of the rear chair leg; the pull rod is telescopically
inserted in the top end of the rear chair leg, the pull rod being
pivotally connected with the front chair leg, the bottom transverse
beam of the rear chair leg being provided with ground-contacting
blocks and ground-contacting block seat bodies coupled with the
ground-contacting blocks, the rear chair leg being provided with a
pivot board which via a pivot member is pivotally connected with a
pivot hole of the rear section of the support board assembled with
the seat; the bottom of two sides of the seat is formed with
insertion grooves, the insertion hooks of the two lateral support
boards being inserted in the insertion grooves, the lateral walls
of the support boards being formed with through holes, fixing
members being passed through the through holes to fix the support
boards with the seat; an inner edge of bottom wall of the support
board is bent to form an insertion wall for inserting into the
insertion groove of the seat, the support board being formed with
two through holes for fixing the seat and a pivot hole for
pivotally connecting with the front chair leg and a pivot hole for
pivotally connecting with the pivot board of the rear chair leg;
two sides of the back are formed with assembling cavities for two
lateral leg rods of the front chair leg to insert therein, a
resilient engaging member being disposed in each assembling cavity,
the engaging member being engaged in the engaging hole of the leg
rod of the front chair leg, whereby the back can be quickly and
easily assembled with the front chair leg; and the upper end of the
pull rod is a pivot head formed with a pivot hole for pivotally
connecting with the pivot member of the front chair leg, a front
lower edge of the pivot head being formed with a locating recess, a
rear end of the pivot head being formed with a locating projecting
block, whereby the locating projecting block of the pivot head of
the pull rod of one foldable chair can be placed and located in the
locating recess of the pivot head of the pull rod of another
foldable chair.
2. Pull rod-type foldable chair structure as claimed in claim 1,
wherein a telescopic rod body of the pull rod is inserted in the
top opening of the rear chair leg, the pivot head of the upper end
of the pull rod being bent outward and leant on outer side of the
front chair leg.
3. Pull rod-type foldable chair structure as claimed in claim 1,
wherein the pivot head and the telescopic rod body of the pull rod
contain a bending angle, a bending neck section being formed
between the pivot head and the telescopic rod body.
4. Pull rod-type foldable chair structure as claimed in claim 1,
wherein the ground-contacting block seat body has a holding mouth
facing upward, an insertion post being formed in the seat body for
inserting into a locating hole of the bottom of the transverse beam
of the chair leg, an inner face of the bottom of the seat body
being formed with a dented face, the ground-contacting block having
elasticity and hardness softer than the seat body being positioned
in the dented face, the bottom of the seat body being formed with
at least one perforation, a projecting block of the
ground-contacting block protruding through the perforation from the
bottom of the seat body for contacting with the ground.
5. Pull rod-type foldable chair structure as claimed in claim 1,
wherein the ground-contacting block is formed with a through hole
for the insertion post of the dented face of the seat body to pass
therethrough, at least one projecting block downward protruding
from the bottom of the ground-contacting block, the projecting
block being fitted through the through the perforation of the seat
body to protrude from the bottom of the seat body for contacting
with the ground.
6. Pull rod-type foldable chair structure as claimed in claim 1,
wherein the lateral wall of the support board is fixed on the seat.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention is related to a pull rod-type foldable
chair structure.
[0002] There are various kinds of foldable chairs. The early
foldable chairs are made of wooden material. The later foldable
chairs made of metal and plastic materials instead of the wooden
material. The metal-made foldable chair has heavy weight and tends
to rust. Therefore, the metal-made chair needs baking finish. This
leads to high cost. Accordingly, it is trend to manufacture the
chair frame of the foldable chair from aluminum alloy. However, the
metal-made foldable chair has limited plasticity so that it is hard
to manufacture the metal-made foldable chair with curved pattern.
Therefore, it is developed to manufacture the seat and back of the
foldable chair from plastic material by molding. The molded seat
and back are assembled with chair frame made of metal or aluminum
alloy so as to achieve solid curved pattern of the chair.
[0003] However, the conventional foldable chairs still have some
shortcomings as follows:
[0004] 1. The foldable chair lacks buffing design. Therefore, when
folding or unfolding the foldable chair, the front and rear chair
legs often instantaneously stretches or collapses. Therefore, a
user, especially a child is very easy to be clamped and injured by
the foldable chair.
[0005] 2. In the case that the foldable chair is equipped with an
oil cylinder to avoid instantaneous folding or unfolding, the cost
will be too high and the foldable chair will have too heavy
weight.
[0006] 3. It is troublesome to assemble the seat and back with the
chair frame of the foldable chair. Moreover, the fixing screws
often protrude from the chair frame to ruin the appearance of the
chair.
[0007] 4. It is troublesome to assemble the seat and back of the
foldable chair so that the production efficiency is lowered.
[0008] 5. When stored, generally the foldable chairs are upright
leant on each other. Therefore, the foldable chairs will occupy
much room.
[0009] 6. The foldable chairs cannot be horizontally stacked. In
the case that the foldable chairs are horizontally stacked, they
tend to slip and fall down. This may lead to damage of the chairs
or even injury of persons.
[0010] 7. The ground-contacting blocks of the foldable chair are
hard. Such hard ground-contacting blocks tend to scrape wooden and
plastic floorboard.
[0011] 8. The frictional force between the hard ground-contacting
blocks of the foldable chair and the ground is weak. Therefore, the
foldable chair tends to slip on the ground.
SUMMARY OF THE INVENTION
[0012] It is therefore a primary object of the present invention to
provide a pull rod-type foldable chair structure in which the chair
frame, the seat and the back can be quickly assembled. The
transverse beam of the chair leg is equipped with elastic
ground-contacting blocks. Therefore, the chair can be used on any
floorboard made of any material such as wooden, plastic and stone
floorboards. The ground-contacting block will not scrape the
floorboard and the chair can be more stably placed on the
ground.
[0013] The present invention can be best understood through the
following description and accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a side view of the present invention;
[0015] FIG. 2 is a front view of the present invention;
[0016] FIG. 3 is a side view of the present invention, showing the
folding thereof;
[0017] FIG. 4 shows that the foldable chairs of the present
invention is horizontally stacked;
[0018] FIG. 5 is a side view of the seat of the present
invention;
[0019] FIG. 6 is a top view of the seat of the present
invention;
[0020] FIG. 7 is a bottom view of the seat of the present
invention;
[0021] FIG. 8 is a sectional view taken along line a-a of FIG.
6;
[0022] FIG. 9 is a sectional view taken along line b-b of FIG.
6;
[0023] FIG. 10 is a sectional view taken along line c-c of FIG.
6;
[0024] FIG. 11 is a side view of the support board of the present
invention for assembling the seat with the chair frame;
[0025] FIG. 12 is a rear view of the support board of the present
invention;
[0026] FIG. 13 is a top view of the support board of the present
invention;
[0027] FIG. 14 is a side view of the right pull rod of the rear
chair leg of the present invention;
[0028] FIG. 15 is a top view of the right pull rod of the rear
chair leg of the present invention;
[0029] FIG. 16 is a rear view of the right pull rod of the rear
chair leg of the present invention;
[0030] FIG. 17 is a side view of the left pull rod of the rear
chair leg of the present invention;
[0031] FIG. 18 is a top view of the left pull rod of the rear chair
leg of the present invention;
[0032] FIG. 19 is a rear view of the right pull rod of the rear
chair leg of the present invention;
[0033] FIG. 20 shows the ground-contacting block seat body of the
present invention;
[0034] FIG. 21 is a left view according to FIG. 20;
[0035] FIG. 22 is a top view according to FIG. 20;
[0036] FIG. 23 is a right view according to FIG. 20;
[0037] FIG. 24 is a bottom view according to FIG. 20;
[0038] FIG. 25 shows the ground-contacting block of the present
invention;
[0039] FIG. 26 is a top view according to FIG. 25;
[0040] FIG. 27 is a right view according to FIG. 25;
[0041] FIG. 28 is a bottom view according to FIG. 25; and
[0042] FIG. 29 is a sectional view of the assembly of the
ground-contacting block and ground-contacting block seat body of
the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0043] Please refer to FIGS. 1 to 3. The present invention includes
a front chair leg 1, a rear chair leg 2, a seat 3, a back 4, two
pull rods 5, two support boards 6 and ground-contacting blocks
7.
[0044] The bottom transverse beam of the front chair leg 1 is
provided with ground-contacting blocks 7 and ground-contacting
block seat bodies 70 coupled with the ground-contacting blocks 7.
Via a pivot member 11, the inner side of middle section of the
front chair leg 1 is pivotally connected with a pivot hole 61 near
the middle section of the support board 6. The outer or inner side
of upper section of the front chair leg is formed with engaging
holes 10 for engaging with the back 4. Via a pivot member 12, the
outer side of the front chair leg 1 between the pivot member 11 and
the back 4 is pivotally connected with the pull rod 5
telescopically inserted in the top section of the rear chair leg
2.
[0045] The bottom transverse beam of the rear chair leg 2 is
provided with ground-contacting blocks 7 and ground-contacting
block seat bodies 70 coupled with the ground-contacting blocks 7.
The inner side of front edge of the rear chair leg 2 is provided
with a pivot board 21 which via a pivot member 13 is pivotally
connected with a pivot hole 62 of the rear section of the support
board 6.
[0046] Referring to FIG. 5, the seat 3 is made by molding. The
bottom of two sides of the seat 3 is formed with insertion grooves
31. The insertion hooks of the J-shaped support boards 6 are
inserted in the insertion grooves 31. The lateral walls of the
support boards 6 are formed with through holes 63, 64. Fixing
members such as screws are passed through the through holes 63, 64
to fix the support boards 6 with the seat 3.
[0047] Referring to FIGS. 11 to 13, the support board 6 is
substantially J-shaped. The inner edge of bottom wall of the
support board 6 is bent to form an insertion wall 60 for inserting
into the insertion groove 31 of the seat 3. The support board 6 is
formed with two through holes 63, 64 for fixing the seat 3 and a
pivot hole 61 for pivotally connecting with the front chair leg 1
and a pivot hole 62 for pivotally connecting with the pivot board
21 of the rear chair leg 2.
[0048] Referring to FIGS. 1 and 2, two sides of the back 4 are
formed with assembling cavities 40 for two lateral leg rods of the
front chair leg 1 to insert therein. A resilient engaging member 41
is disposed in each assembling cavity 40. The engaging member 41 is
engaged in the engaging hole 10 of the leg rod of the front chair
leg 1, whereby the back 4 can be quickly and easily assembled with
the front chair leg 1.
[0049] Referring to FIGS. 14 to 19, the left and right pull rods 5
are symmetrical to each other. The upper end of the pull rod 5 is a
pivot head 50 formed with a pivot hole 51 for pivotally connecting
with the pivot member 12 of the front chair leg 1. The front lower
edge of the pivot head 50 is formed with a locating recess 52. The
rear end of the pivot head 50 is formed with a locating projecting
block 53. The locating projecting block 53 of the pivot head 50 of
the pull rod 5 of one foldable chair can be placed and located in
the locating recess 52 of the pivot head 50 of the pull rod 5, of
another foldable chair. The pivot head 50 and the telescopic rod
body 54 of the pull rod 5 contain a bending angle. Moreover, a
bending neck section 55 is formed between the pivot head 50 and the
telescopic rod 54. When the telescopic rod 54 is telescopically
inserted in the top opening of the rear chair leg 2, the pivot head
50 at upper end of the pull rod 5 is bent outward and leant on
outer side of the front chair leg 1.
[0050] Referring to FIGS. 20 to 24, the ground-contacting block
seat body 70 has a holding mouth 701 facing upward for holding the
transverse beam of the chair leg. An insertion post 702 is formed
in the seat body 70 for inserting into a locating hole A1 of the
bottom of the transverse beam A as shown in FIG. 29. In addition,
the inner face of the bottom of the seat body 70 is formed with a
dented face 703. The ground-contacting block 7 having elasticity
and hardness softer than the seat body 70 is positioned in the
dented face 703. The bottom of the seat body 70 is formed with at
least one perforation 704. The projecting block 72 of the
ground-contacting block 7 protrudes through the perforation 704
from the bottom of the seat body 70 for contacting with the
ground.
[0051] Referring to FIGS. 25 to 28, the ground-contacting block 7
is formed with a through hole 71 for the insertion post 702 of the
dented face 703 of the seat body 70 to pass therethrough. At least
one projecting block 72 downward protrudes from the bottom of the
ground-contacting block 7. The projecting block 72 is fitted
through the perforation 704 of the seat body 70 to protrude from
the bottom of the seat body 70 for contacting with the ground. The
ground-contacting block 7 is fixedly clamped between the dented
face 703 of the seat body 70 and the transverse beam of the chair
leg. The insertion post 702 is fitted through the ground-contacting
block 7 and inserted in the locating hole Al of the transverse beam
A so as to firmly assemble the ground-contacting block 7 with the
seat body 70 and the transverse beam A.
[0052] According to the above arrangement, the present invention
has the following advantages:
[0053] 1. The rear chair leg is pivotally connected with the front
chair leg via the pull rod. Therefore, when folding or unfolding
the rear chair leg, the pull rod 5 provides a pneumatic buffing
effect.
[0054] 2. The pivot head 50 of the pull rod 50 is formed with a
locating recess 52 and a locating projecting block 53. When the
chairs are horizontally stacked, the locating projecting blocks 53
and the locating recesses 52 of the chairs are engaged with each
other. Therefore, the chairs are stably and safely located without
slippage.
[0055] 3. It is convenient and quick to assemble the seat 3, the
support boards 6, the front chair leg 1 and the rear chair leg
[0056] 2. Therefore, the production efficiency of the chair is high
and the manufacturing cost is lowered.
[0057] 4. The back 4 is engaged and assembled with the front chair
by the engaging member 41 without using any screw. Therefore, the
problem of protrusion of the screw is avoided and the back 4 can be
quickly and easily assembled with the front chair leg 1.
[0058] 5. The seat body 70 is hard so that it is firmly assembled
with the chair leg without easy detachment. The softer and elastic
ground-contacting block 7 is directly located in the seat body 70
and protrudes therefrom for contacting with the ground. Therefore,
the ground-contacting block 7 will not scrape the floorboard and
the frictional force between the ground-contacting block 7 and the
ground is greater. Moreover, the ground-contacting block 7 can more
stably attach to the ground.
[0059] 6. The quality of the chair is better.
[0060] 7. The safety in use of the foldable chair is ensured.
[0061] The above embodiment is only used to illustrate the present
invention, not intended to limit the scope thereof. Many
modifications of the above embodiment can be made without departing
from the spirit of the present invention.
* * * * *